diff --git a/README.rst b/README.rst
index 0f47df0..49be09e 100644
--- a/README.rst
+++ b/README.rst
@@ -64,6 +64,7 @@
           rotate: daily
           keep_rotate: 6
           dateext: true
+          maxsize: 50K
 
 Cross-formula relationship
 ==========================